ifplugd and ntp-client: timing issue during boot

[paladin-zero]

I have a minor issue with ifplugd. After ifplugd is started, the boot process proceeds to services requiring the interfaces before they have been established. ntp-client always fails.

I work around the problem by adding a "sleep 20" line at the end of the ifplugd start routine. Is there a better way? I have already added ifplugd to ntp-clients depends list.